Analysis of Power Boiler Furnace Wall and Its Supporting Structure Available to Purchase

In this paper, wall tube stresses of power boiler furnace according to three different design options of furnace wall stiffening system were investigated. As the loading condition, furnace design gas pressure, fluid pressure inside the wall tube and the temperature difference between furnace wall and reaction plate were used. When the simplest design option is applied, wall tube stress levels are unsatisfactory. Furnace design gas pressure has strong influences on wall tube stress in this case. The second option using a reaction plate successfully decreased stresses on furnace wall tubes. However, another problem has arisen from using the reaction plate between furnace wall and wall stiffening H-beam called buckstay. When there are temperature differences between furnace wall and reaction plate, wall tubes are subjected to a large compression load. As final design option, the wall stiffening system using a space plate in addition to the reaction plate was analyzed. The space plate on reaction plate gives room to absorb differential thermal expansion between furnace wall and reaction plate, and satisfactory stress results on furnace wall tubes were obtained.